Transmission-gearing.



C. W. TRANSMISSION GEARING. MPLIGATION Him) APR. 29, '11908.

Patented Nov. 23, 1909.

2 SHEETS-SHEET l.

C. W. PARKER. TRANSMISSION GEARING. APPLIGATION FILED APRJQ, 1908.

2 SHEETS-SHEET 2 /ENTOR 1% A TORNEY Patend Nov. 3, 1909.

UNITED STATES PATENT OFFICE.

CLARK W. PARKER, OFY'SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO LAMB KNIT- TING- MACHINE CO., OF CI-IIIZCGPEJ,T FALLS, MASSACHUSETTS, A CORPORATION OE MASSACHUSETTS.

TnA'NsMrssIoN-GEARING.

Application filed April 29, 1908. Serial No. 429,804.

To all whom 'Lt may concern:

Be it known that l, CLARK WV. PARKER, a citizen of the United States of America, and a` resident of Springfield, county of Hampden, State of Massachusetts, have invented certain new and useful. Improvements in 'lransinissionGearing, of whichv the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention -relates to improvements in transmission gearing and particularly to anv improved form of shock absorbing means for employment between driving and driven elements therein.

In transmission gearing of the type illustrated in U.. S. Patents No. 87 6083- and No.

876084, which were issued to me on the 7th .day of January, 1908', sliding keys are employed for connecting the driving mechanism with parts to be driven, at various rates of speed and in different directions, changes in speed and direction being brought about -by shifting the sliding keys from engagement 'with one set of gearing to another, and in such form of transmission gearing, it will be readily 'seen that unless means be provided for absorbing shock upon the parts, the parts will quickly become damaged, disarranged or worn due to the sudden changes in speed or direction of relative movements, and to this end, I have devised a peculiar' form of shock absorbing device which' is particularly adapted for `relieving the parts during the time such changes are being made.

Inorder that my invention may be fully understood l will now proceed to describe an embodiment thereof, having reference to the accompanying drawings illustrating the same and will then point out thenovcl fea.-

tures viir'clain'is.

In the drawings: Figure l is a view in `longitudinal section through change speed transmission gearing of the sliding key type 1n which my improved coupling means 1s employed. Figs. 2 and 3 are detail longitudinal views'partially in section of the shock absorber', Fig. 3 being a View taken at right angles tothe point of view of Fig. 2. Figs.

V4 vand 5 are detail transverse sectional views relativevpositilons from those in which the parts/"are shown inthe other views.

The transmission gearing as a whole is contained entirely within a closed casing 20, and comprises in general a drive shaft 2l, a driven shaft-22, a pluralityof gear wheels 23 mounted loosely upon the drive shaft 21, a plurality of complementary gear wheels 24 loosely mounted upon. the shaft 22, a pair of sliding keys 25-26 mounted to slide longitudinally in slots or key-ways 27 in the saidl shafts 2l and 22 and a carrier 28 to which the said keys are pivotally connected'. Each of the keys is provided with a tooth or projection 29 at its outer end and with spring pressed means 30 tending to 'move the said outer end of the key outwardly in a radial direction. is provided with a slot or key-way arranged to receive the tooth or projection 29 of one of the keys whenever the said -key is so positioned as to bring the tooth or projection thereof in register with said gear wheel.

The keys are moved` longitudinally for this purpose by movements of the carrier 28, the said carrier being provided with a rack 31, the teeth of which are disposed iii-mesh with a pinion 32 to which movements of rotation may be imparted by any suitable means.

Driving movements are imparted Vtothe drive shaft 2l from a drive pulley 34,1'nount- Patented Nov. 23, 1909.

Each of the gear wheels ed upon a` sleeve 35 which surrounds the said shaft at one end thereof. `vThe construction of this sleeve will be more ap arent by inspectionof Figs. 2 and 3 -of tie drawings. The sleeve is looselyvmounted upon the said lation therewith by means of al spring 36 which is secured at one end by means ofa ,pin 37 to a collar 38 mounted fast up'on the Sha-ft 2l and at the other end to a pm 39 in' The collar 38' is' providedl upon one side of the shaft with a portion 40' the sleeve 35.

arranged to project longitudinallythereof, and the sleeve 35 is provided with a complementary portion 4l arranged longitudinally upon the other side of the shaft/side by side 490l shaft but is connected in yielding'driving're- 1 with the said project-ing portion 40. The

relative positions and the respective areas of `faces of the projecting portions 40v-41 in abutting relation with each other, and the spring is designed to be of such strength as to preferably'just maintain the parts in this 'position when the parts are running free.

Directlyresist'ance, due to work being done, is thrown upon -the driving shaft 21, the spring will be wound up further so that the opposite faces of the parts '40g-41 will approach each other as is shown in Figs. 4 and 1ocks-43'mounted'in the sleeve `35. The

blocks 43 are mounted to slide longitudi nally 'in the said sleeve35, such longitudinal movement being opposedby springs'44.

i absorbe The co-acting faces of the tooth 42 and the 1 blocks 43 are at an angle as is shown in Fig.

wedge-like action between 'the arts, tending 2` of the 'drawings so that there is a cam or to drive thev blocks 43 lon itu inally in op# posite directions as the co lar 38 moves farther forward' with respect to the-sleeve 35 under an increased resistance against the tension of the 'spring 36. Thus, after a certainiamount of resistance has been taken up in the s ring 36, further resistance will be in the movement of the blocks 43 but the blocks in yieldingsave the shock that would otherwise occur if the projection 40 were allowed to have a direct engagement with the projection 41. A

In a coending application, Ser.A No. 414,485, file Feb. 6th, 1908, I have shown a shockvabsorber comprising two co-engaging collars with a spring similar tothe spring 36 between them; but in that case, the spring 36 was desi ed to be very much stronger than the s ring in my present invention, and vthe two co lars were arranged to directly engage when the limit of their relative movements was reached. I find in actualpractice, lhowever,that the tendency of suchA a drive is to cansev a fluctuation of the work,

that is to say, there is not suflicient steadi ness to the drive, and in lathe work, forinstancc, the tendency of the work was to jump forward whenever the resistance lessened, as toward the end of a cut. In the present instance, however, by reason of the fact that the tooth 42 and blocks 43 are designed to be always in en agement whenever anywork is being done, t e drive is much steadier, yet if the resistance is suddenly increased, the

movement permitted vto the block will immediately absorb any sudden shock.v

A collar 45 is arranged to surround a por- `tion of the sleeve 35 and the projection 41 therefrom,\vhereby to form a complete housling for the blocks 43. The blocks 43 may be conveniently splined tothe said sleeve as is shown at 46.

What' I claim is:

1. In transmission gearing of the class de' scribed, the combinationvvith two relatively rotatable elements having abutments arranged for co-engagement to limit the extent of said relativerotative movements, oi

a spring connecting the tWo said parts together in driving relation and under tension' to hold the rear faces of the said abu'tinents together, and shock absorbing 'means' arranged to operate, as the opposite faces of' -A the said abutments; cometogether following relative rotative movements ofthe members against the resistance of .the saidspring.

2. In transmission gearing ofthe class described, the combination with two relativel rotatable 'driving elements providedwit abutments adapted to cci-engage and to limit the relative rotative movement of the. saidelements, one'of the said elements being rovided with a yielding spring pressed ace, of 'aspring for connecting the two said clebeing under tensionV to o pose the engagement of the'one said `a utment yielding face of the other.

3. I' transmission gearing ofthe f character described, the combinationv with two relatively rotatable' drivin and thereby to vlimit the extent of the said rotative movements, one of the ,said abutelements having- .abutments which 'are a apted to co-engage ments havin an angular face and the other A of thef.said' a utments provided with la longitudinally movable spring pressed block adapted to be en aged by the said angular face, of a spring or connecting the two said elements together. in driving. relation, the sa'ids'pringopposing the enga ement ofthe said abutment With the said-b ook,

- 4.v In transnn'ssion garin of the classdescribed, the combination wit .tw'o relatively rotatable driving elements, one of the said elements provided with a tooth having op positely inclined faces and longitudinal movab e spring pressed blocks carried by'the othei` said element, adapted to be engaged by the said inclined faces, of a spring for connecting the two said relements together in driving relation, the tension of 'the said s ring. opposin the engaging of thesaid a utment with t e spring pressed blocks'.

5. In transmission gearing of the class dedriving shaft, of'a sleeve mounted thereon, an abutscribed, y the combination with a.

ment carried by the stadshart, the said abut nient having an angular face, and the said sleeve provided wit face for en -engagementwith-.the said sleeve,

a spi-ing for vpressing the saidv face of the.

abutment long-itudinally'in a direction te ward the face of the abutment upon' the an abutmentv having a shaft, and a s ring for connecting the -sleeve and shav t in driving relation.

6 In transmission gearing of the class described, the combination of a shaft provided with a wedge-shaped abutment located ec? 85 ments together in driving relation, the spring QILLGB:

centricall)T of the axis thereof, a sleeve mounted upon the said shaft, a pair of spring pressed longitudinally movable blocks carried by the said sleeve and arranged for engagement with the opposite faces of the said Wedge-shaped abutment, and a spring connecting the said sleeve and shaft together in driving relation.

7. l'n transmission gearing of the class de scribed, the combination with a driving shaft, a Wedge-shaped abutment carried thereby eccentric of the center thereof,

sleeve mounted rotatively on the said shaft, longitudinal movable blocks carried by the said sleeve, said blocks arranged for co-engagenient with the opposite faces of the Wedge-shaped abutment, springs tending' to press the said blocks longitudinally together,

a housing sleeve surrounding the said longitudinally movable blocks andv the Wedgeshaped projection, and parts carrying the said blocks and projection, and a spring connecting the said sleeve and shaft together in driving relation.

8. ln transmission gearing of the class def scribed, the combination With t-Wo relatively rotatableeleinents having abutments adapted for co-engagement to limit the extent of said relative rotative movements in either direction, of a helical spring connected at its opposite ends to the tivo said members, said spring being under normal tension to canse the @engagement of the saidabutments in one direction.

9. ln transmission gearing of the class described, the combinatlon with two relatively rotatable elements having abutments adapted for co-engagement to limit the extent of said relative rotative movements in either` direction, of a helical spring connected at its opposite ends to the two said members, the axis thereof being coincident With the axis of rotation of the saidelernent, said spring being under normal tension to cause the coengageinent of the said abutment in one direction.

l0. ln transmission gearing of the class described, the combination with a shaft, a helical spring surrounding the same and 'having one end connected thereto, a sleeve rotatably mounted upon the said shaft, the other end of the said helical spring being connected to the said sleeve, the said shaft and sleeve being provided with abutrnentsA arranged for co-engagement to limit the eX- tent of the relative rotative movements of the shaft and sleeve in either direction, the said spring being normally under tension to maintain (go-engagement of the said abutments in one direction.

CLARK W. PARKER.

Witnesses E. C, Finn, L. C. Far. 

